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How to use offer() in android PriorityBlockingQueue?
Before getting into the example, we should know what PriorityBlockingQueue is. It is an unbounded queue and follows the same order as a priority queue. The main usage of priority blocking queue is, it going to handle out of memory error.
This example demonstrates about How to use offer() in android PriorityBlockingQueue
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:gravity="center" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <TextView android:id="@+id/actionEvent" android:textSize="40sp" android:layout_marginTop="30dp" android:layout_width="wrap_content" android:layout_height="match_parent" /> </LinearLayout>
In the above code, we have taken a text view to show PriorityBlockingQueue elements.
Step 3 − Add the following code to src/MainActivity.java
package com.example.myapplication;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.util.concurrent.PriorityBlockingQueue;
public class MainActivity extends AppCompatActivity {
PriorityBlockingQueue priorityBlockingQueue;
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
priorityBlockingQueue = new PriorityBlockingQueue();
final TextView actionEvent = findViewById(R.id.actionEvent);
priorityBlockingQueue.add("sai");
priorityBlockingQueue.add("ram");
priorityBlockingQueue.add("krishna");
priorityBlockingQueue.add("prasad");
priorityBlockingQueue.add("ram");
actionEvent.setText("" + priorityBlockingQueue);
actionEvent.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
priorityBlockingQueue.offer("tutorialspoint.com");
actionEvent.setText("" + priorityBlockingQueue);
}
});
}
}Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from an android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Now click on text view to show the result as shown below −
Click here to download the project code
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